/** 消息类型 */
export enum MessageType {
  /** content发送消息到popup */
  CONTENT_TO_POPUP = 'CONTENT_TO_POPUP',
  /** popup发送消息到content */
  POPUP_TO_CONTENT = 'POPUP_TO_CONTENT',
  /** content发送消息到service-worker */
  CONTENT_TO_SERVICE_WORKER = 'CONTENT_TO_SERVICE_WORKER',
  /** service-worker发送消息到content */
  SERVICE_WORKER_TO_CONTENT = 'SERVICE_WORKER_TO_CONTENT',
  /** popup发送消息到service-worker */
  POPUP_TO_SERVICE_WORKER = 'POPUP_TO_SERVICE_WORKER',
  /** service-worker发送消息到popup */
  SERVICE_WORKER_TO_POPUP = 'SERVICE_WORKER_TO_POPUP',
}
